Multi-Focal Optical Display Paths to Reduce Convergence Conflicts
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Solution Overview
Problem
Existing VR and AR technologies cause eyestrain and dizziness due to convergence conflicts when users continuously watch dynamic 3D images, as the human eyes struggle to adjust to the depth differences between the perspective object and virtual-image planes.
Innovation Solution
An optical displaying system utilizing a display screen with a first and second light splitting unit, imaging units, and optical-path units to convert light into different polarized states, allowing the eyes to adjust dioptrically and alleviate convergence conflicts by presenting images at multiple focal lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VR/AR products present 3D images with depth differences between perspective objects and virtual-image planes, then stereoscopic vision and 3D displaying are achieved, but convergence conflicts occur causing eyestrain and dizziness
Solution Approach 1:
The optical displaying system segments the light path into multiple optical paths with different focal lengths. By dividing the single optical path into multiple segments (first optical path, second optical path, third optical path), each handling different focal length requirements, the system resolves convergence conflicts while maintaining stereoscopic vision capability.
Solution Approach 2:
The system dynamically switches between different optical paths based on the required focal length. The optical displaying device can flexibly adjust which optical path is active, allowing real-time adaptation to different viewing requirements and eliminating static convergence conflicts.
2Object-affected harmful factors
If multiple optical paths with different focal lengths are implemented, then convergence conflicts are alleviated, but device complexity increases
Solution Approach 1:
The system merges multiple optical paths into a unified optical displaying device structure. By combining the first, second, and third optical paths within a single integrated device, the complexity is managed while maintaining the benefits of multiple focal lengths for resolving convergence conflicts.
Solution Approach 2:
The optical displaying device is designed with multi-functionality, where a single device can present images at multiple focal lengths through different optical paths. This universal design allows the device to handle various viewing requirements without requiring separate devices for each focal length.
3Object-affected harmful factors
If images are presented at multiple focal lengths, then user comfort is improved, but optical efficiency and system volume are constrained
Solution Approach 1:
The system applies local quality by optimizing each optical path for its specific focal length requirement. Each optical path is designed with appropriate optical elements (lenses, mirrors) tailored to its specific function, ensuring high optical efficiency while maintaining multiple focal lengths for user comfort.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces eyestrain and dizziness by enabling the eyes to adjust to different focal lengths, improving user experience and allowing for high optical efficiency, small volume, and low cost, while supporting both VR and AR applications.
Implementation Method 1
a first light splitting unit, disposed at a displaying side of the display screen, wherein after a light ray emitted by the display screen passes through the first light splitting unit, the light ray is converted into a first-type polarized light or a second-type polarized light
Implementation Method 2
an imaging unit, disposed at a light exiting side of the first light splitting unit, wherein after a light ray exiting from the first light splitting unit passes through the imaging unit, the light ray forms an enlarged image corresponding to a first focal length
Implementation Method 3
a second light splitting unit, disposed at a light exiting side of the imaging unit, and configured to transmit the first-type polarized light and reflect the second-type polarized light
Implementation Method 4
the first optical-path unit comprises a first reflecting mirror, and a first quarter-wave plate disposed in an optical path from the second light splitting unit to the first reflecting mirror
Data Source
AI summary
An optical displaying system includes a display screen; a first light splitting unit, wherein a light ray emitted by the display screen is converted into a first-type polarized light or a second-type polarized light after passing through the first light splitting unit; an imaging unit, wherein a light ray exiting from the first light splitting unit forms an enlarged image corresponding to a first focal length after passing through the imaging unit; a second light splitting unit; a first optical-path unit, wherein the first-type polarized light transmitted from the second light splitting unit forms an enlarged image corresponding to a second focal length, and is converted into the second-type polarized light, after passing through the first optical-path unit; and a second optical-path unit, wherein the second-type polarized light reflected from the second light splitting unit is converted into the first-type polarized light after passing through the second optical-path unit.